Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 914, in on_next_clicked
    self.dbfilter.ok_handler()
  File "/usr/lib/ubiquity/ubiquity/components/migrationassistant.py", line 229, in ok_handler
    self.run_command()
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 159, in run_command
    self.start(auto_process=auto_process)
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 69, in start
    self.db = DebconfCommunicator(PACKAGE, cloexec=True)
  File "/usr/lib/python2.5/site-packages/debconf.py", line 125, in __init__
    write=self.dccomm.tochild)
  File "/usr/lib/python2.5/site-packages/debconf.py", line 48, in __init__
    self.setUp(title)
  File "/usr/lib/python2.5/site-packages/debconf.py", line 51, in setUp
    self.version = self.version(2)
  File "/usr/lib/python2.5/site-packages/debconf.py", line 60, in <lambda>
    lambda *args, **kw: self.command(command, *args, **kw))
  File "/usr/lib/python2.5/site-packages/debconf.py", line 81, in command
    status = int(status)
ValueError: invalid literal for int() with base 10: ''